Answer to the title of the topic: not very well if at all.
If a cheap way of finding gold is what your after, your better off just buying a shovel, bucket, and a sluice. Get digging, move much more material then that thing. Gold is not easy to find, you usually need to run a lot of material to find any, unless you hit a pocket, but that is uncommon and most likely under several feet of gravel, or in a deep pool, or under a boulder, or all of the previous comments combined .
If a cheap way of finding gold is what your after, your better off just buying a shovel, bucket, and a sluice. Get digging, move much more material then that thing. Gold is not easy to find, you usually need to run a lot of material to find any, unless you hit a pocket, but that is uncommon and most likely under several feet of gravel, or in a deep pool, or under a boulder, or all of the previous comments combined .